The original meaning of the word “church” means those who are called out. Called out from what; you might ask? Called out from darkness or sin and replaced into another realm, that being the church. Col 1:13. Acts 2:47. John 10:9.
Before being called by the gospel of Jesus Christ, a person is in the world and is hell bound. Col 3:6-7. 1 Cor 6:9-11. That person is living in sin and is separated from the comfort of God. But, when obedience to the gospel is done that person leaves the filthy world and takes up existence in the salvation of Christ body, the church. John 3:13-21. Rom 6:1-23. 1 Thess 2:11-13. Eph 2:1-22. Heb 5:9.
Being placed into the church is like being placed into the ark. Once Noah and the others entered the ark, God shut them in. They were saved from the flood because salvation was only in the ark. Gen 6:12-22. Gen 7:5-16. Gen 7:21-24.
If you haven’t obeyed the gospel, you aren’t in the church. If you aren’t in the church, you aren’t saved. If you aren’t saved, you are hell bound. You must obey the word of God and save yourself from eternal destruction. 2 Thess 1:7-10. Acts 2:40-41.